Show the graph in landscape mode for the iPhone App
Once you're in the goal view, you could rotate your phone and the graph would come up filling the landscape view.
AdminAndy B. (Admin, Beeminder) commented
Thanks Dan, that's a great idea. We had something like this in one of the earlier versions but it was too hard to discover.
Did you figure out that you can pinch/double tap to zoom in on the graph from the goal view?